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Scale model analysis of full-duplex communications in an underwater acoustic channel

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3 Author(s)
Smith, K.B. ; Dept. of Phys., Naval Postgraduate Sch., Monterey, CA, USA ; Larraza, A. ; Kayali, B.

Due to issues of in-band artifacts produced by a transmitter that would otherwise influence or jam an adjacent receiver in the near field, current underwater acoustic communication systems employ half-duplex algorithms. This limits the information transfer between nodes to exclusively send or receive at any given time. The use of full-duplex. communications, allowing simultaneous send and receive protocols to be employed, could help improve data transfer rates and error checking. A direct evaluation of the effectiveness of full-duplex transmissions is investigated in a scale-model, shallow water waveguide. The results of simultaneous two-way communications achieved through the use of adjacent, nonoverlapping frequency bands are presented. In this case, use of appropriate filtering of the receptions is being used to minimize cross-talk between bands. Different elements of the arrays are also assigned specific operating bands in order to help reduce cross-talk. The use of orthogonal signals (such as PRN sequences) over common bands is also discussed

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OCEANS, 2001. MTS/IEEE Conference and Exhibition  (Volume:4 )

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